Synthesis and luminescence properties of platinum(II) complexes of 4′-chloro-2,2′:6′,2″-terpyridine and 4,4′,4″-trichloro-2,2′:6′,2″-terpyridine

✍ Scribed by Sarah E Hobert; Jessica T Carney; Scott D Cummings

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 138 KB
• Volume: 318
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(01)00420-0

✦ Synopsis

The complex [Pt(Cl 3 terpy)Cl]PF 6 has been prepared from cis-[Pt(dimethylsulfoxide) 2 Cl 2 ] and 4,4%,4¦-trichloro-2,2%:6%,2¦-terpyridine (Cl 3 terpy). The complex [Pt(Clterpy)Cl]Cl has been prepared from cis-[Pt (1,5-cyclooctadiene)Cl 2 ] and 4%-chloro-2,2%:6%,2¦terpyridine (Clterpy). Complexes have been characterized by 1 H NMR, IR and UV-Vis spectroscopies and elemental analysis. The lowest energy excited state for these complexes is metal-to-ligand charge transfer (MLCT) in character. UV-Vis and low-temperature luminescence spectroscopy indicate that the MLCT state energy is lowered by chlorination of the terpy ligand. Chlorination also has substantial effects on the luminescent properties in fluid solution at 298 K. Unlike the related 'parent' complex [Pt(terpy)Cl] + , the chlorinated terpy complexes are luminescent in ambient fluid solution at 298 K. The 1.9 ms 3 MLCT emission lifetime for [Pt(Cl 3 terpy)Cl]PF 6 is unusually long for a platinum(II) complex in fluid solution.